A study from the National Library of Medicine shows that overweight dogs are more likely to engage in unwanted behaviors.  https://pmc.ncbi.nlm.nih.gov/articles/PMC5468744/

How to prevent dogs from getting overweight

1. Plenty of exercise 
2. Plenty of enrichment and mental stimulation. 
3. Monitor their food intake. 
4. No Snacking. 

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RESOURCES:
Podcast Website: http://puppytalkpodcast.com
Sponsor Website: http://www.topgundogtraining.com
Dale's books: https://www.amazon.com/author/dalebuchanan